Ultimate S’mores Layer Cake with Chocolate & Marshmallow Frosting

If you love the nostalgic flavors of campfire s’mores, this S’mores Layer Cake takes everything you adore and transforms it into a stunning, indulgent dessert. Combining rich chocolate cake layers, creamy marshmallow frosting, crunchy graham cracker crumbs, and silky chocolate ganache, this cake is a complete experience in every bite. It’s bold, sweet, slightly smoky, and incredibly satisfying—perfect for celebrations or when you want to impress.

A traditional s’more is made with graham crackers, melted chocolate, and toasted marshmallows , and this cake recreates those exact elements in a layered format. The result is a multi-textured dessert with soft cake, creamy filling, and a bit of crunch throughout. Inspired by classic layer cakes—stacked with fillings and frostings —this version elevates the idea into something truly unforgettable.

Ingredients

Chocolate Cake Layers

• 2 cups all-purpose flour
• 2 cups granulated sugar
• ¾ cup unsweetened cocoa powder
• 2 tsp baking soda
• 1 tsp salt
• 2 large eggs
• 1 cup whole milk
• ½ cup vegetable oil
• 1 tsp vanilla extract
• 1 cup hot water

Graham Cracker Crunch Layer

• 1 cup graham cracker crumbs
• 2 tbsp granulated sugar
• ¼ cup unsalted butter, melted

Marshmallow Frosting

• 1 cup unsalted butter (room temperature)
• 2 cups marshmallow fluff
• 4 cups powdered sugar
• 1 tsp vanilla extract
• 1 cup mini marshmallows (toasted lightly)

Chocolate Ganache

• 1 ½ cups semi-sweet chocolate chips
• ¾ cup heavy cream

Optional Toppings

• Mini marshmallows (for topping)
• Crushed graham crackers
• Chocolate drizzle

Equipments

• Three 8-inch round cake pans
• Mixing bowls (large and medium)
• Electric mixer or whisk
• Spatula
• Saucepan or microwave-safe bowl
• Cooling racks
• Offset spatula
• Cake turntable (optional but helpful)

Instructions

• Preheat your oven to 300°F (150°C) and line cake pans with parchment paper. Grease the sides lightly.
• In a large bowl, whisk together flour, sugar, cocoa powder, baking soda, and salt until well combined.
• Add eggs, milk, oil, and vanilla extract. Mix until smooth and fully incorporated.
• Slowly pour in hot water while mixing. The batter will be thin—this is normal and ensures a moist cake.
• Divide batter evenly among the prepared pans.
• Bake for 30–35 minutes or until a toothpick inserted comes out with a few moist crumbs.
• Remove cakes and let them cool completely on a rack.
• Increase oven temperature to 350°F (175°C).
• In a bowl, mix graham cracker crumbs, sugar, and melted butter.
• Spread mixture onto a lined baking sheet and bake for 8–10 minutes until lightly golden.
• Let cool completely to form crunchy bits.
• To prepare frosting, beat butter until creamy and smooth.
• Add marshmallow fluff and mix until fully combined.
• Gradually add powdered sugar and beat until fluffy.
• Stir in vanilla extract.
• Fold in toasted mini marshmallows for added flavor and texture.
• For ganache, heat heavy cream until just steaming (not boiling).
• Pour over chocolate chips and let sit for 3–5 minutes.
• Whisk until smooth and glossy. Allow to cool slightly.
• To assemble, place one cake layer on a serving plate.
• Spread a thin layer of ganache over the cake.
• Add a layer of marshmallow frosting on top.
• Sprinkle graham cracker crunch evenly.
• Place the second cake layer and repeat the process.
• Add the final cake layer on top.
• Apply a crumb coat of frosting and chill for 20–30 minutes.
• Frost the entire cake with remaining marshmallow frosting.
• Press graham cracker crumbs around the bottom edges.
• Pour ganache over the top, allowing it to drip down the sides.
• Decorate with toasted marshmallows on top.
• Chill for 30 minutes before slicing to set layers properly.
• Slice and serve for best texture and presentation.

Recipe Information

• Prep Time: 45 minutes
• Bake Time: 35 minutes
• Total Time: 1 hour 20 minutes
• Servings: 12–14 slices
• Cuisine: American
• Course: Dessert

Nutrition Information (Approximate)

• Calories: 520 kcal
• Protein: 6 g
• Carbohydrates: 65 g
• Fat: 25 g
• Fiber: 3 g
• Sugar: 48 g
• Sodium: 300 mg

Flavor Profile Breakdown

• Rich chocolate base
• Sweet marshmallow creaminess
• Crunchy graham cracker texture
• Smooth chocolate ganache finish
• Slight toasted flavor from marshmallows

Tips for Best Results

• Use high-quality cocoa powder for deep flavor
• Don’t skip hot water—it enhances moisture
• Toast marshmallows lightly for authentic flavor
• Chill between layers for stability
• Use a serrated knife for clean slices

Variations & Substitutions

• Use milk chocolate instead of dark for sweeter flavor
• Add peanut butter layer for twist
• Swap graham crackers with digestive biscuits
• Use store-bought marshmallow cream if needed
• Make cupcakes instead of a full cake

Mistakes to Avoid

• Overbaking cake layers
• Using hot ganache on frosting (it will melt)
• Skipping cooling steps
• Overmixing batter
• Not leveling cake layers

Serving Suggestions

• Serve slightly chilled or at room temperature
• Pair with coffee or milk
• Add extra chocolate drizzle when serving
• Garnish with fresh berries for contrast

Storage Tips

• Store in fridge up to 5 days
• Keep covered to prevent drying
• Bring to room temperature before serving
• Freeze slices individually for up to 2 months

Why You’ll Love This Recipe

• Combines nostalgic s’mores flavors
• Rich, indulgent, bakery-style dessert
• Perfect for celebrations
• Balanced textures in every bite
• Customizable and visually stunning

How to Serve

• Slice with a warm knife for clean cuts
• Serve on dessert plates
• Add whipped cream if desired
• Best enjoyed fresh

FAQs

Can I make this cake ahead of time?
Yes, you can bake layers a day ahead and assemble later.

What makes it taste like s’mores?
The combination of chocolate, marshmallow, and graham crackers creates the classic flavor.

Can I use store-bought frosting?
Yes, but homemade gives the best flavor and texture.

How do I toast marshmallows without a torch?
Use your oven broiler for 1–2 minutes carefully.

Can I make this cake in one pan?
Yes, but layering gives the best texture and presentation.

Why is my cake dry?
Overbaking or too much flour can cause dryness.

Can I skip the graham cracker layer?
You can, but it adds essential crunch and flavor.

How do I get perfect ganache drips?
Let ganache cool slightly before pouring.

Can I use dark chocolate?
Yes, for a richer and less sweet flavor.

Is this cake freezer-friendly?
Yes, wrap slices tightly and freeze up to 2 months.